[Mesa-dev] [RFC] r600g multi ring

[j.glisse at gmail.com]

So first patch is the winsys change while second patch implement multi ring
in the r600g driver. It use a stack to keep track of the order into which
rings must be submited. If will only pop the necessary entry from the stack
depending on the current request.

I think this address all concern from the previous patch. I am testing it
with dma (third patch not included here).

Cheers,
Jerome